Arkaever: The Solution I found, based on previous discoveries by those who posted here, is this:
1 - Go to the "\Revenant\Modules\" folder
2 - Make a copy of "Ahkuilon.rvm" to another folder, in case something goes wrong.
3 - Open "Ahkuilon.rvm" with a program capable of reading ZIP files
4 - Extract all files to a temporary folder
5 - Change the properties of the "keep.s" so it ISN'T Read-Only
6 - Edit "keep.s" and change all instances of "Sardok.say" to "SardokT.say" (without the quotation marks)
7 - Save "keep.s" and change properties so it IS Read-Only again
8 - Pack all files in the temporary folder into a ZIP file WITH THE COMPRESSION METHOD SET TO NO COMPRESSION ("Store" is the compression method's name in WinRAR, you will have to figure out the name in other programs). Make sure the directory structure in the ZIP file is the same as the original
9 - Delete "Ahkuilon.rvm"
10 - Rename the ZIP file to "Ahkuilon.rvm" and place it in the "\Revenant\Modules\" folder
11 - Delete temporary folder
And that's that. The program will now run perfectly as far as Sardok's lines at the Keep are concerned.
If you can't play the game after this process, just restore the old "Ahkuilon.rvm" you saved just in case.